CentraView - Browser based Enterprise Java (J2EE) Contact Management, Groupware, Collaboration, CRM, SFA, Project Management software. Run locally or as a hosted service. Built on Apache Tomcat, JBoss, MySQL, Linux (Fedora, RedHat and others) & Windows
FreeMiCal allows the bulk export of MS Outlook appointment items to RFC 2445 conformant iCal format. .NET 2.0 or greater and Outlook 2003 or 2007 Interop Services required.
Team Elements is an Enterprise 2.0 team collaboration suite. It ties discussions, wikis, RSS, project and document management, and federated search into a unified application. It is database-driven with rigorous role-based access and permissions.
Leavecal is a vb.net application that helps your company keep track of annual leave days, public holidays, maternity, sick days and more. It is a leave calendar based on South African rules but it allows you to customize it for your business or needs